南水北调西线工程几个特殊的工程地质和岩石力学问题

SPECIAL PROBLEMS OF ENGINEERING GEOLOGY AND ROCK MECHANICS IN THE WEST ROUTE OF SOUTH-TO-NORTH WATER TRANSFER PROJECT

南水北调西线工程地处高寒地区,存在一系列工程地质和岩石力学问题,其中,一些非常规问题往往难以发现或不被重视,如断裂活动性与洞室抗断问题、特大可能泥石流问题、洞室高压涌水和突泥问题、高地温引起的岩石物理力学性质改变问题、高地应力场及其演变问题、TBM条件下的岩石力学问题、区域地质环境变迁问题等.这些问题处理不好,可能会带来灾难性后果.提出并讨论上述一系列问题,以引起岩石力学与工程领域同行们的注意.

The strategic West Route of South-to-North Water Transfer Project locates in sharp cold area of China. The special problems of engineering/geology and rock mechanics existing in the project, such as active faults and related issue of tunnel faulting, potential disaster of debris flow, high pressure water flow and debris flow in the tunnel, high earth temperature induced deterioration of rock properties, high in-situ stress and its variation tendency, rock mechanics problems related to TBM, and the potential regional changing in geological environment, etc, are challenging for the geotechnical engineers. It is difficult to reveal and estimate the potential disaster for the project. The particular problems and some of the disaster results are discussed, and the guideline for further investigation is proposed.